Frederick Barbarossa, also known as Federico Barbarossa, was a Holy Roman Emperor during the 12th century. He was also referred to as "Redbeard" due to his long red beard. Barbarossa was known for his military campaigns, particularly his involvement in the Crusades. He also played an important role in shaping the political landscape of Europe during his reign. Other synonyms for Frederick Barbarossa include "Frederick I," "Frederick of Swabia," and "Friedrich I von Hohenstaufen." Despite being a legendary figure in European history, Frederick Barbarossa's legacy is still debated by scholars today.